Malicious PDF — malware analysis report

Static analysis result for SHA-256 d79ac37986d6cffe…

MALICIOUS

PDF

90.3 KB Created: 2021-07-01 17:28:03 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 5.11.3) First seen: 2021-09-13
MD5: e38482ea1161cdc11da212e89c389b8a SHA-1: dcabc59ab9bc2c6d75ca9d87d79ed1e92e4efd61 SHA-256: d79ac37986d6cffeaf327bb254bdc9dea76decca7ec9c2168e90ec2549ce71ea
96 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

The PDF document contains a large number of links, many of which point to domains that appear to be compromised or disposable. The ML classifier strongly indicated maliciousness, and the link farm structure suggests an attempt to lure users to external sites, likely for further exploitation or phishing. No scripts were extracted, and the document body was unreadable binary data.

Machine Learning

  • Nyx PDF Classifier malicious score 0.9947

Heuristics 5

  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Object number defined twice with different bodies info PDF_DUPLICATE_OBJ_BODY_INCREMENTAL
    The same indirect object (N G) is defined more than once with different body bytes. First-wins and last-wins readers will resolve different content, which is a parser-confusion shape used by targeted PDFs. Body-only differences are common in benign incremental updates, so severity is raised only when the duplicate carries active content.
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://acryl-bg.com/userfiles/file/valituvuxepinabuta.pdf In PDF document text
    • https://mfdesign.hu/files/file/nopipogor.pdfIn PDF document text
    • http://asirius.su/wp-content/plugins/super-forms/uploads/php/files/d03ee8a5dda56671beccc315ee09fce1/11754430844.pdfIn PDF document text
    • http://www.icodar.com/wp-content/plugins/formcraft/file-upload/server/content/files/1609db5398cfa8---24876456889.pdfIn PDF document text
    • https://stcatherine.ac.ug/wp-content/plugins/formcraft/file-upload/server/content/files/1609fce0db7427---62993945828.pdfIn PDF document text
    • http://asea-admin.com/_userfiles/file/20210512081219.pdfIn PDF document text
    • https://endoaccessories.com/wp-content/plugins/super-forms/uploads/php/files/5l03f4aeksqcgr8ahiqn2sv72u/35784126958.pdfIn PDF document text
    • http://www.meglobalinc.co.za/wp-content/plugins/formcraft/file-upload/server/content/files/1608a40619d605---teraselosolejune.pdfIn PDF document text
    • http://www.sunaryem.com.tr/wp-content/plugins/super-forms/uploads/php/files/hh512g9q245uabp5o7ko2dh772/97377300935.pdfIn PDF document text
    • http://hoondb.com/wp-content/plugins/formcraft/file-upload/server/content/files/16080d16daaf1b---borogevolebet.pdfIn PDF document text
    • http://subventionsbetrug.de/wp-content/plugins/super-forms/uploads/php/files/n1e7sq0l5gqsnl9nngbkaes44a/76327399465.pdfIn PDF document text
    • https://nicemexico.net/wp-content/plugins/formcraft/file-upload/server/content/files/160a18d2207df1---pigiwidaxinamotuse.pdfIn PDF document text
    • http://smartmedicaleg.com/wp-content/plugins/formcraft/file-upload/server/content/files/160b4dcdfa5694---57932754880.pdfIn PDF document text
    • http://dhf-china.com/d/files/tirubajagavixesitibetolu.pdfIn PDF document text
    • https://www.pferde-fuer-unsere-kinder.de/wp-content/plugins/formcraft/file-upload/server/content/files/1609cfc4357e31---18517249599.pdfIn PDF document text
    • http://elonsummerstorage.com/wp-content/plugins/formcraft/file-upload/server/content/files/1606d91363f9dc---kejawixujap.pdfIn PDF document text
    • http://hopkinshigh62.com/clients/7/77/7764523e397120ad9b09b1da26998858/File/3973828701.pdfIn PDF document text
    • https://yucekalipmakina.com/tsrm1/img/userfiles/file/27921901316.pdfIn PDF document text
    • http://vmkmsz.hu/userfiles/file/gogotosuk.pdfIn PDF document text
    • http://richardarnoldalumni.com/clients/a/ad/ad1dcfa6f69ac51e3fe6bec18f6cf6d6/File/27872595236.pdfIn PDF document text
    • http://phenix-security.fr/wp-content/plugins/formcraft/file-upload/server/content/files/16070dbb541285---guronitajigedesivovolo.pdfIn PDF document text
    • http://consulcongress.it/uploads/assets/file/zabose.pdfIn PDF document text
    • https://talaa-obour.com/webmisr/uploadwebmisr/file/71693261181.pdfIn PDF document text
    • http://puzynowska-kancelaria.com/userfiles/file/fojupi.pdfIn PDF document text
    • https://feedproxy.google.com/~r/1eyvgo/aqOO/~3/YTWXjIUwRh0/uplcv?utm_term=book+of+ruth+commentary+pdfPDF link annotation
    • http://www.w3.org/1999/02/22-rdf-syntax-ns#In PDF document text
    • http://purl.org/dc/elements/1.1/In PDF document text
    • http://ns.adobe.com/pdf/1.3/In PDF document text
    • http://ns.adobe.com/xap/1.0/In PDF document text
    • http://ns.adobe.com/xap/1.0/mm/In PDF document text
    • http://ns.adobe.com/xap/1.0/rights/In PDF document text
    • http://dejavu.sourceforge.netIn PDF document text
    • http://dejavu.sourceforge.net/wiki/index.php/LicenseIn PDF document text

Extracted artifacts 3

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000fa00.bin pdf-font-stream PDF embedded font (sfnt) at offset 0xFA00 18380 bytes
SHA-256: a99401cefc4426bb7dad0ff913f254eb948ad5d68e36ac9d6b6ba6625ac3f40c
font_01_sfnt_off00012939.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x12939 10940 bytes
SHA-256: 53316047b675f2b469e983790b57b3c41cedbd04d3abd02d073c6dc99f0da870
font_02_sfnt_off00014282.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x14282 16792 bytes
SHA-256: 9d2294e344127da9ddc2b77d68b1576b6b78373885bc9da2859f180a98f2c1e1

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